DI - Beginners Question

Hi all, first of all sorry if this question was answer elsewhere I looked for it and found some similar examples but when I try to implement the solution (Found in this kind of post) I get an error message.

I am trying to use a really simple DI example, the configuration file does a few thing but the part that is causing problems is the following (I will erase everything but the part that is causing problems to keep it simple):

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The line in red is causing the following error:

I am trying to do this simple DI but is not finding the properties but I honestly don't know why, if someone could give me a hand i would be much appreciated.

I agree with David. You have to do something about your naming convention. This not only looks awful, but it's also prone to errors. Check this document. These are only guidelines, but worth to follow.